Pump.



v. z SHEETS-SHEET 1.

Patented Nov E'. M. METGALP.

PUMP.

APPLICATION FILED FEBJB, 1913.

P. M. METGALF.

PUMP.

APPLIGATIDN FILED FEB. 1s, 1913.

1,077,419. Patented Nov. 4, 1913.

FOSTER M. METCALF, OF BATTLE CREEK, MICHIGAN.

PUMP.

To all whom t may concern:

Be it known that I, Fosrnn M. MiiroALr, a citizen of the United States,residing at Battle Creek, in the county of Calhoun and State ofMichigan, have invented certain new and useful Improvements in Pumps, ofwhich the following is a specification, reference being had therein tothe laccompanying drawings.

This invention relates to improvements in pumps and its leading objectis to provide a simple pump having duplex cooperating suction pistonsand duplex delivery pistons. Another object of the invention is theconstruction of a pump in which the usual cause ofob'jectionablevibrations and pulsations is eliminated.

AA still further object of the invention is the provision of a pump withan efficiently operating piston adapted to be reversed to.

be operated for suction or for delivery.

A still .further object of the invention is the provision of a pumpframe orvcasing which may be easily assembled and easily taken down toenable the parts thereof .to be readily and satisfactorily cleaned.

A still further object of the invention is the provision of a pump frameor casing having end caps or closing members and clamping bolts forholding said caps vin sealed positions on the cylinder ends. l/Vith theabove and other objects inview the invention embraces certaincombinations, constructions and arrangements of parts, clearly describedin the following speciiicationl and clearly illustrated in theaccompanying drawings, in which Y. l v Figure 1 is a horizontalsectional view showing the construction of the pump pistons and valvesand the manner of mounting the pistons on the pump rods, which are shownin parallel ,arrangement7 and also showing an operating motor in plan.Fig. 2 is a side elevation showing the means for clamping the end capsof the pump cylinders in position and also showing the operating motor.Fig. 3 is a central sectional view of one of the pump pistons and itsvalve. VFig. 4 is a sectional view of the pump piston. Fig. 5 is a planView thereof. Fig. 6 is a side elevation of the valve spring. Fig. 7 isa sectional view of the valve. F ig. 8 is a plan view thereon. Fig. 9 isa sectional view of a spring stop collar. Fig. 10 is a plan viewthereof. V

Referring to the accompanying drawings Speccaton of Letters Patent.

Application led February 1S, 1913.

Patented Nov. 4, 1913. Serial No. 749,131.

illustrating the preferred embodiment of the invention 5 designates thebase, which is-provided with upstanding edge fianges 6, which form acatchment basin. Suitable openings 7 are formed in the base forreceiving screws or other fastening devices, whereby the base may beattached to any suitable support, such as atable or the floor of theroom in which the pump is to be used. One end of the base is formed witha table portion 8 on which the pump frame and mechanism rest.

The frame of the pump comprises a cylinder 9 and a cylinder 10, whichare disposed in parallel relation to each other and `are held inrelative positions by the end caps 11 and 12. AThe end caps 11 and 12are 'formed with circular seats 13 to receive the ends of the cylindersand suitable gaskets 14 are arranged on said seats to seal the gointsbetween the end caps and the cyliii` ers.

The end cap 11 is provided with feet 11 which are secured to the base bymeans of bolts 15, only one of which is shown. This end cap 11 isfurther provided with an upstanding lug 16. The end cap 12 is providedwith feet 12 which rest on the base and a clamping bolt 17 is secured atone end to the lower portion of the end cap 11 and at the other end bythe wing thumb nut 18 to the lower portion of the end cap 12. rlhe endcap 12 is provided with an upstanding lug 19 and a 'clamping bolt 20 isextended through the lug 16, of the end cap 12, and said bolt isprovided with a head 21 on one end` and a wing nut.22 on the other end,whereby the end caps may be tightly clamped on the ends of the cylinders9 and 10.

'The cylinders 9 and 10 are made in duplicate and are provided withlateral nipples 23 and 24, respectively, and which nipples are-locatedmidway of the ends of the cylinders. A pipe 25 is secured by thecoupling nut 26 to the nipple 23 and a pipe 27 is secured by thecoupling nut 28 to the nipple 24.

The nipples 23 and 24 and their pipes are shown in the drawing inhorizontal planes, but said nipples may be readily disposed in any planedesired by turning the cylinders on their seats in the end caps, and onecylinder may be turned one way and the other cylinder may be turned theopposite way, so that one nipple will lie in one plane or be disposed atone angle to the base and the othernipple will lie in another plane orbe disposed at another angle to the base.

The end cap 11 is provided with suitable glands 29 and 30, through whichthe piston rods 31 and 32 operate. Y

The pump rod 31 carries piston heads 33 and 34, which are duplicates ofeach other, and which consist of central sleeve 35 and a cylindricalbody 36, which is secured to said sleeve by the radial arms 37. A valveseat 33 is formed on end of the piston head and a. disk valve 39, whichis provided with a sleeve 40 slidably embracing the sleeve eX- tension35a of the piston head, is` held on said valve seat 33 by a helicalspring 41, positioned around said sleeve 40, and which engages acircular iange 39a formed on the disk valve 39, by its inner and largerend, and engages a collar stop 42, having the seat 42,2t therein, by itsouter and smaller end. The stop collar 42 is slidably disposed on thepump rod, as indicated in Figs. 3, and Fig. 1. Each pump rod is formedwith a shoulder 43 which is engaged by one end of the innermost valve orpiston head thereof, and its outer end is threaded to receive a wingthumb nut 44, which is adapted to hold the twin piston heads and valvesof each pump rod in place. The piston heads 33 and 34 are spaced apartby means ot a sleeve 45, slidably disposed on the pump rod.

rlChe pump rod 32 carries twin piston heads 33 and 34, which areduplicates of the piston heads 33 and 34, and coperating valves 39,spring seated by the springs 41. rEhe pump rod 32 is formed with a stopshoulder 46` and its free end being screw threaded as at 46 rlhe outerends of the pump rods 31 and 32 are connected to each other by means ofa coupling rod crosshead 47 and -nuts 43. The crosshead 47 is connectedto a motor shaft 49, which may be operated by any suitable motormechanism 50, a steam motor being shown as merely a convenient form ofmotive power.

In the drawings the piston heads andvalves of the pump rod 31 are shownto be lation. The piston heads 33 and 34 and their coperating valves aredisposed with the valves in confronting relation. The piston heads ofthe pump rod 32 and their cooperating valves may be arranged as the piston heads and coperating valves of the pump rod 31, and those of saidpump rod 31 may be arranged as those of the pump rod 32.

"When the shaft 49 is operated to drive the pump rods 31 and 32 thevalve of piston head 33 will be unseat-ed during the inward movement ofthe pump rod 31 and the valve of piston head 34" Will be unseated duringthe simultaneous inward movement of the pump rod 32. During the outwardmovement of said pump rods the valve of piston head 34 of the rod 31will be unseated and the valve of piston head 33 of the rod 32 will beunseated. The liquid will be drawn`l into the cylinder 9 by thereciprocated pistons 33 and 34 forced through the valve closed openingsthereoi into the passages 11a and 12, formed by the end caps 11 and 12.In other words, on the outward stroke of the piston rod 31 the pistonhead 34 will draw the liquid into the cylinder 9 and the valve of thepiston head 33 will unseat to allow the liquid to pass through saidpiston head. On the inward stroke of said rod 31 the piston head 33 willdraw liquid into the cylinder 9 and the valve of the piston head 34 willunseat to allow the liquid to iow throughsaid piston head 34. When thevalve of the piston head 33 is open or unseated the valve of the pistonhead 34 is also open and when the valve of the piston head 34 is closedthe valve of the piston head 33 is closed. By this construction one ofthe valved piston heads of the rod 31 will draw at each stroke of saidrod and one of the valved piston heads of the rod 32 will act to forcethe liquid to delivery. As the valved pistons are made alike any one ofthe valved piston heads can be substituted for 'any ofthe others, and asthe cylinders and their nipples are int-ercliangeable the inlet valvedpiston heads of one of the pump or piston rods may be placed on theother pump'or piston rod, to change the direction of flow of the liquidthrough the cylinders.

they other rod, so that the conflict of forces "When it is ydesired* toclean the interior of the pump, which is particularly designedv i'or usein connection with pumping milk, the end cap 12*- is removedbyunscrewing the thumb nut 20a, which holds t-he bolt 17? Y. i clamped` tothe end lug 12b,Y and which bolt is` pivoted to the lug 5a of the base5, and the thumb nuts 18 andl 22 are unscrewed from `the ends of theclamping bolts or rods 17 and 20, thus permitting the end cap V12 andthe two cylinders 9 and 10l to be withdrawn. After the end cap andv thecylinders have been removed from their normal positions. the pistonheads of bo-th of the piston or pump rods may be removed by unscrewing pThe movement of the valved piston heads of one rod balances the movementof the valved piston heads of which takes place in the usual pumping opi`eration -is avoided, and a uniform inflow and outflow of the liquid ismaintained. On `each stroke two of the piston heads are closed and twoare open, andv the opening l and closing 'of the piston heads does notin- =.volve a fluid reaction or a mechanical disturbance.l

arranged for suction action, that is with their open ends disposed inconfronting re` the thumb nuts 44 from the ends of said i rods andVthereby releasing said piston heads and their coperating valves. It willbe seen, therefore, that the connecting bolts permit the cylinders andthe operating parts to be separated and easily sterilized or cleaned.

The nipples and their pipes are readily adjustable without interferingwith the clamped end caps. Mason jar washers may be employed as gaskets.

Having described my invention I claim A pump comprising companioncommunieating cylinders, each cylinder having a nipple, piston rodsworking in the cylinders, valved piston heads on one of the rods withoutwardly opening valves, valved piston heads on the other piston rodwith inwardly opening valves; each piston head consisting of a centraltube adapted to be secured to the piston rod, a cylindrical body adaptedto slide against the cylinder Wall, a perforated end wall connectingsaid cylindrical body and tube, a sleeve projecting outwardly of the endwall, a valve collar seatable onthe end wall and slidable on the sleeve,a coiled spring bearing against the Valve collar to hold the sameseated, and a stop collar for holding the spring in place.

In testimony whereof I aiiiX my signature in presence of two witnesses.

FOSTER M. METCALF.

Witnesses:

HOWARD I-I. METCALF, THOMAS GALLOWAY.

Copies o1 this patent may be obtained for ve cents each, by addressingthe Commissioner errements, Washington, D. C.

